He goes by the nick SurvivorGrim, and what he created serves as a superb example of the direction that combat audio in realistic games should be heading. Using Battlefield 2 as a basis, he created a small sound mod that adds the supersonic crack effects into the game.
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Some people have raised questions as to the flaws of this model. For those of you that have never heard it in reality and can't distinguish where it does things right and where it's wrong, I'll clarify. At close range, the muzzle blast of the weapon should dominate and drown out a lot of the 'snap', whereas at further ranges the muzzle blast will have become muffled and the snap will be crisp and loud. So, the close-quarters sections of this video are not entirely accurate, but the long-range stuff is a good example of how it should sound.